Stackable container



FIG. 1 is a top view of a stackable container;

FIG. 2 is a bottom view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is a lower perspective view thereof;

FIG. 5 is a side view thereof; and,

FIG. 6 is an upper perspective view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a stackable container, as shown. 